+ Reply to Thread
Results 1 to 3 of 3

Thread: Subflooring

  1. #1
    Join Date
    Sep 2009
    Posts
    1

    Default Subflooring

    The builder of our 45 yo house used what appears to be old porch board, or old siding for the subflooring. We have chosen tile and hardwood flooring to install over this. Does the subflooring need to be replaced if we use hardibacker under the tile and the liner under the hardwood flooring?

    I don't want to install the new flooring, have to break it all up and redo it, if the subflooring isn't adequate.

    Any suggesstions are appreciated!!
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

Name:	445.jpg 
Views:	44 
Size:	15.8 KB 
ID:	2816  

  2. #2
    Join Date
    Jun 2007
    Location
    Fayette County, Ohio
    Posts
    5,798

    Default Re: Subflooring

    If the sub-floor is solid and no squeaks it should be no problem. Solid wood sub-floors where used a lot longer than OSB or ply wood.
    Jack
    Be sure you live your life, because you are a long time dead.-Scottish Proverb

  3. #3
    Join Date
    Sep 2009
    Location
    Cleveland,Ohio/San Diego, California
    Posts
    18

    Default Re: Subflooring

    Barb,

    I agree with jack, plank sub-flooring has been around for a longer period of time than any sheeting alternative.

    In regards to the Tile portion of your question. The planking you have should be around 3/4" thick. Common rule of thumb for sub-flooring under any tile is minimum 1-1/4". This is due to deflection. For example, if you have a 3/4" sub-floor you will need to add a minimum of 1/2" underlayment. In wet locations it is best to use a cement based product. Any less than 1-1/4" and you run the risk of cracking grout lines or even worse, tiles popping up.

    Now with the hardwood flooring, You can go right over the current sub-floor. But, keep in mind of flooring heights. For example, If you are laying tile down, the flooring height will be as follows: 3/4" current sub floor + 1/2" new sub floor + 1/4" thinset mortar + 1/4" tile = 1-3/4" of tile flooring height. Now if you calculate your hardwood flooring: 3/4" current sub floor + 3/4" hardwood flooring = 1-1/2". This means the height between your tile and hardwood is off by 1/4". If your budget allows you may want to add sub flooring to your hardwood installation to bring the tile and hardwood to the same height.

    Hope my suggestions help you and good luck.

    Pete

    _______________________
    Measure once, Cut twice

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •